There are many superstitions in Britain. But one of the most widely-held is that it is unlucky to open an umbrella in the house. It will either bring misfortune to the person that opened it or to the household. The person who opens an umbrella in fine weather is very unpopular. It is very unlucky to walk under a ladder. If you must pass under a ladder you can avoid bad luck by crossing your finger and keeping them crossed until you have seen a dog.
The number 13 is said to be unlucky for some. And when the 13th day of the month falls on a Friday, many of the people prefer to stay at home.
The worst misfortune that can befall you is breaking a mirror. That will bring you seven years of bad luck. This superstition is supposed to have originated in ancient times, because mirrors were considered to be tools of the gods.